*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Typography scale */
.text-xs   { font-size: 0.75rem;  line-height: 1.4; }
.text-sm   { font-size: 0.875rem; line-height: 1.5; }
.text-base { font-size: 1rem;     line-height: 1.6; }
.text-lg   { font-size: 1.125rem; line-height: 1.6; }
.text-xl   { font-size: 1.25rem;  line-height: 1.5; }
.text-2xl  { font-size: 1.5rem;   line-height: 1.4; }
.text-3xl  { font-size: 1.875rem; line-height: 1.3; }
.text-4xl  { font-size: 2.25rem;  line-height: 1.2; }
.text-5xl  { font-size: 3rem;     line-height: 1.1; }
.text-6xl  { font-size: 3.75rem;  line-height: 1.05; }
.text-7xl  { font-size: 4.5rem;   line-height: 1.0; }

.font-mono { font-family: var(--font-mono); }

.text-cyan    { color: var(--cyan); }
.text-purple  { color: var(--purple); }
.text-pink    { color: var(--pink); }
.text-muted   { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-green   { color: var(--green); }

.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }
.fw-900 { font-weight: 900; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }